Boiler-furnace



(No Model.) 2 Sheets-Sheet 1. P. LUDWIG.

BOILER FURNACE. v No. 372,422. Patented Nov. 1, 1887.

(No Model.) 2 Sheets-Sheet 2..

P. LUDWIG. BOILER FURNACE. No svzAzz. Patented Nov. 1, 1887.

wwmooeo I gwvmdoa I I 61 0 ma A z UNITED STATES PATENT; OFFICEv FREDERICK LUDVIG, OF GLENCOE, MINNESOTA.

BOlLER-FURNAQE;

SPECIFICATIONforming-part oL-Letters Patent No. 372.422, dated November 1,1887.

useful Im 'n'ovements in l'loilerFurnaces, of

which the following is a specification My invention relates to steam-boiler furnaces, and has reference more particularly to that class which are employed in connection with portable engines, though applicable to other uses. V

In the accompanying drawings, Figure 1 is a perspective view of my improved boler-furnace; Fig. 2, a vertical longitudinal central sectional view of the same; Fig. 3, a transverse section on the line of Fig; 2; Fig. t, a transverse section on the lineg 1 Fig. 5 isa similar view on the line .1 .2, and Fig. ti an enlarged detail view.

A indicates the boiler proper, provided with a series of tire-tubes,-a,, substantially as in ordinary lire-tube boilers.

13 indicates a hollow or double-walled U- shaped body, which is firmly riveted or otherwise secured to the overhanging sides'ot't-he boiler proper, as clearly shown in Fig. 3, the body I extending rearwardly behind the rear end of the boiler, as shown in Fig. 2, in order to form a smoke chamber, 7, which will allow the products of combustion to pass into the rear ends of the fire-tubes a. The chamher 0 extends beneath the boiler, as shown in Figs. 2, I and 4, and in the space between the lower side of the-boiler proper and the body 1 I place the grate l), which consists, preferably, ofthree or more tubular bars or pipes, b,- as shown in Figs. 2 and 3. At its rear end the body ll is turned or extends upward to receive the rear ends of the pipes b, as shown in Fig. 2, the front ends of the pipes screwing into the hollow box or chamber E, as clcarly shown in l igs. 3. and 4. Into the upper side of the box or chamber 1*) enter-two pipes, c and d, the formercommunicating with the upper portion of the boiler A. while the other, (I, enters the boiler A. near its bottom, as indicated in Figs. 2 and l.

The grate-bars b will preferably be. supported at a point between their ends by means of a bridgepieee or support, F, which rests at opposite ends upon the inner walls oft-hamseflh'xo. 941,985. mi m at) her oifbody I as clearly indicated in Fig. 3,

thereby preventing the bars from sagging. The frontplate, G, of the furnacc is provided with doors H for feeding fuel to the furnace, with a large door, I, directly opposite the frontend of the boiler, to permit the cleaning of its fines, and with door or damper J, which regulates the' admission of ,air beneath the grate, as clearly shown in Figs. 1 and 2.

' In the rear end or upright portion of chamber or body 13 is an opening, e, immediately beneath the grate I), which permits the cin-- dcrs, &c to be removed from the rear end of the ash-pit K, the. opening a being closed by a valve or damper, f, as clearly indicated in Fig. 2.

Extending forwardly from the lower edge oft-he boiler A. is a diaphragm, 5', which prevents the productsof combustion from passing upward in front: of the boiler, but causes them to pass rcarwardly beneath the latter through the chamber C, thence forward through the tire-tubes (r to the front end of the furnace, and finally out through the smokestack L, as shown in Fig. 2.

From the foregoing construction it will be seen that the hollowwall chamber 13 and the tubular grate-bars I; communicate by means of the pipes c and d with the water-space of the boiler, and of course, as fire is built upon the grate, the water in the grate-bars and in the chamber B becomes highly heated, thereby utilizing to the fullest possible extent all the available heat.

The furnace is designed particularly for burning straw; but it is apparentthat coal or other suitable fuel may be used. 7

The upper portion of chamber 0 in rear of the boiler is covered by a rooting, M, of tirebriek or other suitable material, as shown in Fig. 2.

Extending horizontally across the chamber 0 are three or more pipes, N, which, as shown in Figs. 5 and 6, connect at each end with the water-spaceof the U-shapcd chamber B. The manner of connecting the pipes N with the U- shaped body is clearly illustrated in Fig. 6, upon reference to which it will be noticed that the pipes are provided at each end with acap, O, which latter, as well as the pipe N, is

tapped or threaded to receive the threaded ICC tube or hollow bolt I. The bolt 1? is provided 1 distance therefrom, and having the upwardly- 60 with an enlarged angular head, Q, and is turned rear end, foriningachamber, C, at the threaded throughout its entire length, so that it may screw not only into the pipe N and its cap 0, but also engage with both walls or plates that make up the U-shaped body. As shown in Fig. 6, this bolt ishollow from end to end, and is threaded at its outer end to receive a plug, R, which prevents the escape of ;and the water-space B.

water; and it will also be noticed that at a point between the walls of the chamber B it is provided with a hole, S, by which communication is established between the pipes M IVhcn it is desired to clean out the pipes N, the plug R will be removed and a cook or faucet inserted and steam forced through the pipes from end to end; or, in lieu of the plugs R, the faucets or cocks may be-cmployed to close the ends of the hollow bolts P, as shown in Fig. 5,t-his plan being preferable to the former, as the cocks will always be ready for use. ,The

products of combustion passing up around the pipes N heat to a greater or less extent the water therein, from which it will bescen that the heat is distributed over a greatamount of surface.

The pipes c (1 may enterthe box or chamber E at the sides instead of' from the top, if desired. I

A bar or beam, T, extends ,transversely across the upper portion of the upturned end of/the water-chamber B, asyclearly shown in ,Fig. 2, thereby stiffening and strengthening the combination, with the boiler A and the.

U-shaped body or chamber B, secured to the under face thereof and separated a suitable distance therefrom, of the hollow grate-bars b,commnnicating with the chamber B at their rear ends, a hollow box or chamber, E, at the forward end of the grate-bars, and a pipe or pipes communicating with the boiler A and the box or chamber E, all substantially as shown.

3. In combination with boiler A, the U- shapcd body B secured thereto, separated a rear end of the boiler, a covering, M, for said chamber 0, tubular grate-bars b communicating with the rear end of chamber or body B, a

hollow box, E, at the forward end of and communicating with the grate-bars, pipes c and d, communicating with the boiler: and with the chamber E, a flange or diaphragm, g, extending from the lower edge of the boiler to the front wall or plate of the furnace, and a chimney, L, all substantially as shown.

4. In combination with the boiler A, provided withthe laterally-extending or overhanging portions, the U shaped body or chamber B, secured to saidoverhanging portion, and

a grate, D, located within the space between the shown.

' 5.In combination with a boiler, A, and a U-shaped body, B, secured thereto, substantially as shown, the pipes N,connccting the opposite walls of body B and communicating with the water-space of the latter.

6. In combinationv with boiler A, the U- shaped body B, extending beneath and in rear of said boiler, thereby forming a chamber, C, and aseries of pipes, N, extending horizontally across the chamber 0 and communicating at opposite ends with the water-space of the body B. I

7. In combination with thehollow U-shaped body B, pipe N, a hollow bolt, 1, screwing through the walls of the body B and into the end of the pipe, a plug, R, closing the outer end of the hollow bolt-,and an opening, S, in the hollow bolt communicating with the water-space of the chamber B.

8. In combination with-the hollow body B, pipes N, provided at opposite ends with caps 0, bolts 1, screwing through the walls of the body B and into the ends of the pipes N, said bolts being provided with hole S, plug It, and angular head Q, all substantially as shown.

9. In a boilerfurnace substantially such as shown, the combination, with the boiler and the U-shaped chamber B, of hollow grate D, box,or chamber E, and pipes c, d, and N, all arranged for operation substantially in the manner shown. I

In witness whereof I hereunto set my hand in the presence of two witnesses.

FREDERICK LUDWIG.

Witnesses:

J om: LUITEN, HERMANN LUITEN. 

